It is narrated from Sayyiduna Jabir (may Allah be pleased with him): I heard the Messenger of Allah (peace and blessings be upon him) say: "When one of you has a servant who has spared him the toil (of preparing food), let him feed him (with himself); and if he does not do so, let him at least hand him a morsel (of that food)."
No one narrated this hadith from al-Awza'i (may Allah have mercy on him) except Yahya bin Hamzah (may Allah have mercy on him), and his son is alone in narrating it from him.